[R-390] Airborne R390 on ebay

[Mike Peace]

Hi Robert,
Is it possible to purchase a serviced  R648/ARR41 and get the schematic for
the prototype120vac supply?
I don't have any dynamotor experience for airborne.
Cheers,
Mike
VK6ADA

On Wed, Aug 20, 2025 at 1:01 PM robert meadows via R-390 <
r-390 at mailman.qth.net> wrote:

>  Well, Here we go again. The R648/ARR41 IS NOT A FLYING R390.  Many think
> that simply because of the dial which looks like the R390 digital dialThe
> Radio, ARR 41 was designed and built on a US NAVY Contract for the early P3
> Aircraft.  It was retrofitted in the P2 as well.Originally intended to be
> the additional receiver for HF reception of primarily Radito Teletype which
> was the primary HF communication methodfor about the entire life of the P3
> Orion.  Navy MPA (Maritime Patrol) folks decided that the pair of ARC
> 94/xx/xx, civilian Collins 618T HF transceivers were sufficient for the job
> and as the P3A "grew" (actually did as the initial P3 was a shortened
> Lockheed commercial turboprop, by some 88 inches,the R-648 radios were
> removed, with some going into various aircraft.
> I have all the manuals, references, as well as the only existing complete
> copy of the Depot Level Servicing and Maintenance,ANd,About a dozen of the
> radios, new and as removed racks.
> In addition to that little treasure trove, I have R648/ARR41 Serial Number
> X1.  A prototype with Collins built internal 120VAC power supply insteadof
> the standard 28VDC dynamotor, and there are traces of USB/LSB at the
> AM/CW/CW Sharp switch positions.
> Last time I looked on the federal stock listings, the radio was still
> listed as active and procurable for something like (here goes memory)
> $18,000 with a DEMILCode of D, which means that none may be surplused
> without total destruction.  That was changed after the batch I have were
> sold.
> I will provide radios that are as removed for $800, Racks are around
> $300.Serviced radios to the Specifications are more.
> Cheers AllRobert W4RRDOrange Park, FL
>     On Wednesday, August 20, 2025 at 12:50:30 PM EDT, Perry Sandeen via
> R-390 <r-390 at mailman.qth.net> wrote:
>
>  List,
> FWIW
> Military Aircraft Radio r-648/arr-41 Receiver Collins WORKING R-390
> Arr-41     US $795.00  Located in: Smyrna, Delaware, United States
>   eBay item number:116704917477.
> This is very rare.  First one I've seen on ebay for many years.
> Perry KM6FQV
>
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